U.S. Senator John McCain said on Sunday he would like relations between United States and Pakistan to improve as they have a common enemy in the Islamic State and other radical Islamist groups. Relations between Pakistan and United States have been frayed over the past decade, with U.S. officials frustrated by what they term Islamabad’s unwillingness to act against Islamist groups such as the Afghan Taliban and the Haqqani network. Pakistan rejects harboring militants but says there are limits to how much it can do as it is already fighting multiple Islamist groups and is wary of “blowback” in the form of more terror attacks on its soil.